tempering return temps

radioconnection_2

http://www.bellgossett.com/Press/BG-insand.asp

This is a good tutorial on boiler bypass protection by B&G. One trick is using the unused port on the weighted flow check for the bypass loop connection. A step above would be to use a Danfoss Thermic Valve in a bypass loop to assure the return temp is never under 140 degrees minimum.

Pete

fatty

in a pretty standard, single pump, hot water system:
i was thinking -(and i'm not a pro)- a system's return temp could be adjusted simply by piping a small line with a full port ball valve, after the pump, directly into the return (with sufficient space to mix in with the return water) - then the return temp could be adjusted... in a constant way... to step closer to the desired delta t of 20 degrees - by throttling the ball valve. are there too many variables for a simple tempering bypass like this to work? a search provided me with mostly radiant floor results.
I'm not sure if its idiotic or not, it just occurred to me
Thanks!

Brad White

This is how good ideas come about....

I favor the automatic approach (Danfoss thermic valve) but your open-minded thinking came to an excellent solution, rather good also that you saw a potential problem...

Not a pro but maybe one in training... or a ringer